Improvements in machines for grinding the cutters of mowers



tric-htte l 'tends'outward the handle D.

" main bar, as shown at E.

`tofact asa ily; tached to the bar Alatthe rear end ofthe arc (Land its plane of rotation `is perpendicular'tothe plane of .the saidJarc; i

c* arrangeur-msx, or wELLsviLLn New roux Letters Patent No'. 112,330,Vdated March 7, 1871.

" IMPROVEMEN-rinl MACHINES FoRcRiNDING THE coTTERs oF iviowians,v ac.

` The Schedule referred to in these Letters Patent and making part ofthe same.

Toall when it may concern: i

l Be it known. that I, HENRY CLAY FISK, lof Wells-` ville, in theconnty ofrAllegany and Stateof New York, have invented-a new and valuable Improvement in Mowinga'nd Reapiug-Machiue Gummersor Grinders; and 1 do ,hereby declare that the following is a full, clear, and exact description of the construction andopera'tion ofi the same, reference being had `to the `annexed drawing making a part of this specification i and to` the letters `and figures of referencegmarked thereon.,r i

, Figure l of the drawing. is aireprescntation of myA invention in plan view. k Y

" Figure 2 is a central vertical section of the gummerhead; also side view.

My invention" has relationto means for grinding and sharpening the ,teeth of reapersand mowers with- ,l out removing the knife from the cutter-bar ofthe ma- `chine; and y A1t consists ni `the construction and novel arrangement `of devices whereby I am' enabled to use a flattened gi'inding-wlieel,`designed to reach with facility every part ofthe edge of 'the' tooth from heel to point to forni a strong cutting-edge thereon, and to operatereadily on both edges ofthe tooth without turning the M machine over. i

The letter A` ofthe` drawing represents thev main bar of my instrument, haying` at one end the pressurebar B, adapted to be held against the side inoperatin g `the same.- l

C designates a, semicircular bar, ,which .connects the `two portions ofthe main bar A.

i Y From the middle portion oflthis curved bar C ex- At itsforwardend the main bar A forms an elbow, at` or about' the angle of ninety degrees, withthe said rlhis elbow extends downward at right'angles with the planejof thercurve G, andii'om its lower end extends forward the ,bearing z in a direction parallel, or`

nearly pjarallel, withv the barr A.

` `(urrepifesents the driving-wheel, made of good size Thiswheel rotates on a journal atlhis driving-wheel,l is providedgwith teeth Aon the `side next the main bar, in sfthemanner of a crownwheel, and isplacedlinengagementwith thepinion a on, the rear endof thershaft H, which is placedonjthe upper side ofthe bar A, and has its bearingsiurlioites,

` b b, extending upward therefrom.` i

The shaft H is somewhat Vlonger than the forward l To'tbe forward end'ot' the shaft H, which extends beyond the bar A, is secured a bevel-wheel, I.

This bevel-wheel I engages with a similar bevelwheel,- J, on tlieiupper end of the shaft d,.which is j ournaled in the bearing z and carries on its4 lower end the 'grinding-wheel K. It will .be observed that the shafts d and H are parallel to the plane of the drivingwheel, and form with each other an angle' of about ninety degrees, s o that, if the shaft H be held in a horizontal position, the shaft d will be vertical, and the wheel K will have a horizontal motion of rotation. The object of the above-described construction is, therefore, the production of a horizontal rotation of the grinding-wheel by a verticalA rotation o f the drivingwheel.

Y The-grinding-wheel K may be made of stone, emery,

composition tanite, orl other grinding material, and its Indeed, a plane-wheel may beemployed with good results; but the preference is given totthe at cone, as thereby the operator is enabled to' reach with facility the re-entering angles of the cutter-bar.

As the plane of rotation of the grinding-surface forms a low angle with the plane of the surface beingy ground, the grinding-lines will be circular arcs, whose radiuses' are nearly parallel with the surface being ground, hence there will be little or no -concavity in the ground edge 'of the; tooth. `'lhe bevel of the cntting-edge will approximate a plane surface, which is regarded as stronger'than the concave or razor-edge, and 1n`ost suitable for mowers and reapers.

An important advantage gained in my improvement will be observed 'in changing from one edge of the tooth to the other. y

The instrument is adapted to grind these op'poste .bevels by simply giving the wheel K a slight dip toward the edge lof the tooth being-ground, and at the E Sametime raising or lowering the right hand operating the crank-wheel G; Therefore the shafts H and d have an angular position with reference to each oth'- er, and lie parallel with the plane of the driving-wheel.

quenceof contact with refractory substances, the dat grinding-wheel?` serves an excellent purpose in restoring the edge. To remove such a gap or nick the wheel is rst turned so that it will rotate vertically, when, npon being brought in Contact with the cutting-edge, it will grind the edge down even with the bottom of the gap, and true. The wheel is then changed to the the crank-wheel G, and forming an angle with the oonneoting-shaft or main bar, substantially as and for the purpose specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

HENRY CLAY FISK.

Witnesses z C. H. FISHER, HENRY N. Loma. 

